Just rebuilt my motor today. Granted it's my fisrt time. Got it back together, Airsal 65cc, stock carb, #66 jet, tecno estroil pipe. When I started it up it runs but won't idle. Sounds loud...clacky...and alot of fuel mist is blowing back out of the carb through the airfilter. Double checked the reed valve and everything seemed okay there. Now the big question...does it sound like I put the piston on backwards? And, if so, have I f--ked anything up by running it abit? And which way is forward? Thanks.